snippet216.java

Eclipse JAVA开发软件中SWT各控件范例源码

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Tool Tips example snippet: show a tool tip inside a rectangle
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet216 {
	public static void main (String [] args) {
		Display display = new Display ();
		final Color [] colors = {
			display.getSystemColor (SWT.COLOR_RED),
			display.getSystemColor (SWT.COLOR_GREEN),
			display.getSystemColor (SWT.COLOR_BLUE),
		};
		final Rectangle [] rects = {
			new Rectangle (10, 10, 30, 30),
			new Rectangle (20, 45, 25, 35),
			new Rectangle (80, 80, 10, 10),
		};
		final Shell shell = new Shell (display);
		Listener mouseListener = new Listener () {
			public void handleEvent (Event event) {
				switch (event.type) {
					case SWT.MouseEnter:
					case SWT.MouseMove:
						for (int i=0; i<rects.length; i++) {
							if (rects [i].contains (event.x, event.y)) {
								String text = "ToolTip " + i;
								if (!(text.equals (shell.getToolTipText ()))) {
									shell.setToolTipText ("ToolTip " + i);
								}
								return;
							}
						}
						shell.setToolTipText (null);
						break;
					}
			}
		};
		shell.addListener (SWT.MouseMove, mouseListener);
		shell.addListener (SWT.MouseEnter, mouseListener);
		shell.addListener (SWT.Paint, new Listener () {
			public void handleEvent (Event event) {
				GC gc = event.gc;
				for (int i=0; i<rects.length; i++) {
					gc.setBackground (colors [i]);
					gc.fillRectangle (rects [i]);
					gc.drawRectangle (rects [i]);
				}
			}
		});
		shell.setSize (200, 200);
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		display.dispose ();
	}
}